Throughput Analysis with Dynamic Spectrum Access Control in Space-Air-Ground Integrated Networks

As a promising architecture to provide ubiquitous and ultra-reliable network connectivity, space-air-ground integrated network (SAGIN) has attracted substantial research interests. In this paper, we propose a dynamic spectrum access control (DSAC) protocol for the SAGIN. Specifically, the proposed DSAC protocol uses sequences to represent the spectrum access decisions for authorized users at different time slots. Through iterative and orthogonal sequence transformation, the DSAC protocol can generate orthogonalized sequences to guarantee successful spectrum access for authorized users. In addition, the non-collision probability of the data packets accessing the shared spectrum under the guidance of DSAC protocol is analyzed, based on which a closed-form expression of the system throughput is further derived. Simulation results are provided to validate the accuracy of the theoretical analysis and demonstrate that the proposed protocol is effective in access control and throughput improvement in the SAGIN when compared with the existing random access protocol.